We use polyurethane to make just about everything—garden hoses, furniture, the entirety of my local 99-cent store. It's easy to produce, durable, and dirt cheap. What it isn't is recyclable—there isn't a single natural process that breaks it down. That is until a newly-discovered Amazonian fungus takes a bite. »1/31/12 1:00am 1/31/12 1:00am